Transmission main shaft

R

Rolzey

New member
I just had these two bearings replaced in my primary area. The part numbers are, 34091-08 & 9231. If someone would be so kind as to show a diagram pointing out exactlly where these go I would great apprecate it.
Thanks in advance JONNIEROCK
 
Like you ,I planned to go over 100k with this one, I am at 54k now. I am retired now and this is the bike I planned on riding off into the sunset.My bearing failed at 38k and for now everything seems fine but I am just wondering if I have a time bomb in the transmission ready to go off. The first week I bought this bike in 07 I brought it back because of the clattering in 5th and 6th. This was about 6 months before they came out with the IDS. The factory rep came down and rode it and said he understood my noise complaint but assured me H.D. was working on a fix and to ride with peace of mind that the transmission was rock solid. Then I still have a hard time getting over that when the IDS came out to cure the noise I had to pay for it.They never did give a good technical explanation for the clattering noise and I can't help but wonder if it was this main drive gear bearing all along. Then of course it waited for a few months after the warranty ran out for it to go.
The other thing I am having a hard time getting over is when I bought this bike I traded in my 2002 which was the best bike I ever owned you know just had to have the new latest 96" 6 speed. Live and learn.
 
Primary inner bearing race and bearing.
http://www.bikebandit.com/2008-harley-davidson-motorcycle-touring-ultra-classic-electra-glide-flhtcu/o/m18634
 
You know the more i think of what you said about the clattering influencing the Bearing failure. The more I think all this points to that as a possible contributor. If not the culprit?
I still firmly believe (as I did back in 07) the 07's clattering is the effect of incongruous harmonics. Starting with the long stroke, moving through the ill-equiped stock Comp, then through the pre-revised Main shaft and Main Drive Gear, and ending up at the solid mounted Rear Drive Pulley. Weather or not it caused the Main Drive Gear Bearing failure or not, it does seem ironic that besides the long stroke, all other areas have been revised!

FWIW - if you haven't installed the IDS yet - I have to say it was a drastic improvement on my bike! I installed it at around 30k, and I think my bearing "started" failing at 20K. So maybe the IDS could have prevented it, had I caught it in time?
 
LOST AGAIN, JOIN THE CROWD. Since you say primary I assume you are in the primary. Scorp is in the transmission. If you are indeed in the primary look at item 1 the inner race of this bearing that is pressed on the shaft in attachment 4_pulling inner primary bearing. The outer bearing race and rollers are in the second attachment 2_Inner primary bearing. I think the inner race is also shown as item 16 in the first attachment inner primary bearing
Question for Scorp??? Your post 68, I do not think most people realize that when Harley went to he helical cut gears that run quieter then straight cut the transmission pick up side loads thrusts since when helical gears run together they want to push also in opposite directions and the regular ball bearing can not take this side load and it takes a bearing with a shoulder on one side (can not be on both sides sine it then would be impossible to put together) I do not have a service manual for the helical transmission. can anyone add the attachment for this? Also, in post 68 it appears this bearing is a two part assembly pressed on in opposite directions. There is also another balling bearing setting next to it. Is there actual 3 rows of bearings? Can the two thrust bearing be pressed too tight toward each other cause problems?
 
Actually, the Main Drive Gear bearing rides on a two piece inner race, which is pressed together from the bearing manufacturer, and it remains to gether as the Main Drive Gear is pressed into it.
This bearing is a two row bearing. But unlike a single row bearing, the outer wall of the inner race is higher up onto the ball, and does accomplish (somewhat) the task of a thrust bearing/washer. The Outer race of the bearing does the same thing, only it has a higher rib in the center of the race. Similar to your 3rd picture, only mirror that bearing about a vertical plane to get two rows. It definitely takes into accout the opposite side loading forces you speak of.
It cannot be adjusted internally either. It is dependant solely on manufacturing tolerances from the bearing manufacturer.
 
Reference post 47 fig 2 and post 35 attachment Inner primary bearing. OK The big picture. Please correct me where I am wrong. Left to right main drive gear which is also the shaft coming out of transmission with spline on it that the belt drive pulley slides on. Next a inner bearing race with thrust facing right. Then what appears to be two spacer washers. Then a smaller diameter dark area that I thought was the start of the spline for the pulley. Then what appears to be two spacer washers. Then another inner bearing with two different race diameters for a duplex bearing with thrust facing left. Then the spline but it appears to be too short for the drive pulley. Questions 1. Is there actual 3 rows of bearings? 2.In this picture has the right duplex race been pulled out some from were it should be? 3. Are the four spacer washers actually that and before you torn it down all pushed together? 4.Is this bearing 6 in post 35 attachment named Inner primary bearing 5.Lastly all this is in end of transmission but must come out from side door of transmission?
 
I doubt the IDS will solve the bearing failure as I had my first one fail at 20K and had recently then installed the IDS. Now at 65K it is going in to get it replaced again and the IDS was installed for all the miles on this now failed bearing.
 
My bearing howling at 50-60mph an clicking sounds while pushing backwards started again two days before a trip to S. Colorado and Taos, NM. Went ahead anyway with the trip and when the howling occured just turned up the radio. Just got back yesterday and 4.4K miles and everything held together. Now making an apppointment to take it in for its 2nd bearing replacement (previous one at 20K). Luckily have extended warranty.
 
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